CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jiao Huang,Jun Wang,Ziyang Liu,Fangming Shen,Jinjian Zhang,Yongyuan Ren,Xiaoli Zhan,Qinghua Zhang
Asymmetric electrolytes with both anode and cathode compatibility are promising candidates for high-energy–density batteries and high-safety lithium metal batteries (LMBs). However, the asymmetric electrolyte is still hindered by the complex multi-layer coating process, resulting in multiple internal interfaces of the electrolyte and poor battery performance. Herein, a one-step constructed asymmetric electrolyte with gradient distributions of 2‐ureido‐4[1H]-pyrimidinone functionalized carbon nanotubes (UPy-CNTs) is prepared via the dual driving forces of solvent evaporation and fluoropolymer migration. On the one hand, during the solvent evaporation process, based on the competitive effect between evaporation of solvent and diffusion of dispersions, the gradient distribution of asymmetric electrolyte can be constructed by enhancing evaporation and inhibiting uniform diffusion. On the other hand, due to the abundant hydrogen bonds between UPy and F, the gradient distribution of UPy-CNTs can be further promoted when the fluoropolymer spontaneously migrates to the surface. The gradient distribution of UPy-CNTs not only greatly increases Young’s modulus of the asymmetric electrolyte on the Li metal side, but also can adjust the Li + solvation structure to form a LiF-rich solid electrolyte interface (SEI), thereby inhibiting the generation and growth of lithium dendrites. Because of the ingenious structure of the asymmetric electrolyte, the ionic conductivity is 0.226 mS cm −1 and the Li + transferences number is 0.79. Prominently, Li||Li symmetric batteries can stably cycle for 2500 h at 0.1 mA cm −2 and 0.1 mAh cm −2 . In addition, Li||LFP batteries can maintain a high specific capacity of 146 mAh g −1 after 200 cycles at 0.5C.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Zhuojiao Liu,Yajing Cao,Xin Wang,Wen bo Li,Wen Zheng,Chenhui Yang,Aibo Zhang
In this paper, 2-ureido-4[1H]-pyrimidinone (UPy) containing quadruple hydrogen bonding interaction was selected to introduce into the polyimide containing epoxy-imide, the dynamic covalent network and hydrogen bonds networks would be constructed via the interaction of carbamide groups, isocyanate groups, acylamino groups, hydroxyl groups and amino groups, which are conducive to the self-repairing properties and mechanical properties. The aim of this paper is to prepare a repairable, recyclable and repair-condition-friendly epoxy-imide material. FT-IR, XPS and tensile tests were used to characterize the structure and mechanical properties. The repair conditions were investigated. Due to the introduction of UPy, at the same temperature of 60 ℃, the completely repaired time for EP-UPy3 scratches was 30 min, while for EP-3 scratches, the completely repaired time was 120 min. The repair conditions were further improved due to the action of UPy. More critically, UPy contents have an important effect on the mechanical properties. The tensile strength of EP-UPy3 (0.01 mol) samples achieved the maximum (27.89 MPa), which is much higher than that of EP samples (9.69 MPa) and the tensile strength of the repaired EP-UPy3 (27.75 MPa) is still higher than that of the repaired EP-3 (9.02 MPa), confirming that the introduction of UPy is significant to the improved mechanical properties of epoxy-imide materials. Moreover, the samples of EP-UPy have recyclable and processable properties, which is significant to broaden the epoxy-imine self-repair materials with a valued application prospect.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Shuai Yuan,Jian Hu,Jin Yang
A series of UPy-functionalized conductive polyurethane elastomers (UCPUs) were synthesized by using p-phenylene diisocyanate (PPDI) and 2-ureido-4[1H]-pyrimidinone (UPy) as hard segments and extending the molecular chain by aniline trimer (AT). To improve the thermal stability and mechanical properties of UCPUs, aminopropyl terminated polydimethylsiloxane (PDMS) has also been introduced into soft segments. The correlation between microphase separation structure and thermal stability, mechanical properties, and self-healing performance was investigated using multiple characterization techniques such as DSC, DMA, XRD, SAXS, ATR-FTIR, POM, and so on. The addition of UPy constructed a dynamic cross-linked network and slightly reduced the heat resistance of UCPUs. The introduction of PDMS significantly improved the thermal stability and mechanical properties. The tensile strength, thermal stability, and self-healing efficiency of the UCPU-40% (U5) with the most balanced performance can reach 33.9 MPa, 303°C, and 21%, respectively. All UCPUs have excellent processability and recyclability, and their electrical conductivity can also be controlled by changing the doping amount of (1S)-(+)-10-camphorsulfonic acid (CSA). This developed UPy-functionalized conductive polyurethane with notable thermal stability and partial mechanical recovery properties may provide a new reference for preparing heat-resistant conductive polyurethane material.
研究领域:
材料科学
·
高分子化学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jingdao Li,Hao Jiang,Yuhui Xie,Zhijiao Wang,Feng Wu,Dong Feng,Yang Meng,Yi Mei,Delong Xie
The increasing demand for thermally conductive adhesives (TCAs) in high-performance electronic devices necessitates materials with both flame retardancy and thermal conductivity. Conventional TCAs often struggle with balancing these properties, particularly due to poor interfacial compatibility between fillers and the resin matrix. To address this challenge, this work introduces a novel approach by functionalizing boron nitride nanosheets (BNNSs), with 2,6-bis(urazole-1-yl) pyridine (UPy). This modification enhances both thermal conductivity and flame retardancy in EP-based composites. Thermogravimetric analysis revealed that the initial decomposition temperature ( T 5% ) of the 20-UPy-BNNSs/EP composite increased to 344.8 °C, a 74.0 °C rise from pure EP. Microcalorimetry tests showed a 42.7 % reduction in peak heat release rateand a 17.7 % reduction in total heat release compared to pure EP. Vertical burning tests demonstrated that the 20-UPy-BNNSs/EP composite significantly delayed ignition and suppressed molten droplet formation. In practical electronic device testing, the 20-UPy-BNNSs/EP composite reduced the surface temperature of LED drivers by 53.3 °C compared to the control, highlighting its effective thermal management. These results confirm that UPy modification improves the interfacial interaction between BNNSs and the EP matrix, leading to increased thermal conductivity and flame retardancy. This work proposes a promising strategy for developing high-performance TCAs tailored to next-generation electronics.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 35
·e55887
·
IF 2.7
Zixian Li,Jun Zhu,Peixin Niu,Hui Wang,Ailing Sun,Liuhe Wei,Xiancong Huang,Junxian Chen,Yuhan Li
The implementation of hot melt adhesives reaching structural adhesion with both impact resistance and detachability is of prospective industry value but still remains challenging. In this work, 2-amino-4-hydroxy-6-methylpyrimidine serving as both chain extender and end-capping reagent due to its isomerism, was developed to construct a supramolecular polyurethane-derived hot melt structural adhesive. The as-synthesized PUM elastomers occurs obvious decrease of molecular weight at 80°C compared to room temperature, revealing the existence of self-complementary 2-ureido-4[1H]-pyrimidinone (UPy) motifs at chain ends. This unique structure allows to chemically incorporate abundant hierarchical and quadruple hydrogen bonding moieties, which results in remarkable enhancement of shear strength, ranging from 6.4 to 16.6 MPa. More importantly, it also exhibits unique impact-strengthening and reproducible adhering ability. The Hopkinson-press-bar and cyclic tensile tests manifest that quadruple hydrogen bonds play a pivotal role in buffering external forces and increasing energy dissipation when exposed to high velocity impacts. The true stress and strain synchronously increase as the strain rate augments while the shear strength can even roar up to ~18 MPa at high tensile speed. With regard to mild synthetic conditions, atomic economic use of reactants, it is promising that this material has industrial potential to be utilized in applications referred to energy-absorption and reproducible structural adhesion.
研究领域:
材料科学
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化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2020
·Vol. 305
·期 7
·2000042
·
IF 3.853
Yimei Chen,Yanli Meng,Yanfeng Luo,Yuanliang Wang
Linear shape memory polyurethanes based on poly( dl -lactic acid) (PDLLA) macrodiol (PDLLA-SMPUs) have various advantages such as good processability, biodegradability, shape memory effect, and biocompatibility, yet the insufficient mechanical properties prevent their effective applications in bone repair. 2-Ureido-4[1 H ]-pyrimidone (UPy) can form strong quadruple hydrogen bonding. Here, a new linear PDLLA-SMPU containing pendant UPy units (UPy- p -PDLLA-SMPU) is designed and synthesized. The pendant UPy units may dimerize to form physical crosslinking among UPy- p -PDLLA-SMPU chains. As a result, UPy- p -PDLLA-SMPU demonstrates both good processability and significantly higher mechanical properties than the corresponding linear PDLLA-SMPU without pendant UPys. In addition, UPy- p -PDLLA-SMPU shows excellent shape memory effect near body temperature, with a shape fixity ratio of up to 98.6% and a recovery ratio of up to 92.9%. This work provides a new strategy to design SMPUs integrating the merits of linear and crosslinked polyurethanes, and the obtained UPy- p -PDLLA-SMPU is a promising material for bone tissue repair in view of the mechanical, thermal, and shape memory properties.
研究领域:
材料科学
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生物医学工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2019
·Vol. 37
·期 12
·1257-1266
·
IF 2.804
Li Ting,Zheng Tian-Ze,Guo Zhao-Xia,Xu Jun,Guo Bao-Hua
A well-defined quadruple hydrogen bonding strategy involving dimerization of 2-ureido-4[1 H ]-pyrimidone (UPy) units is innovatively designed to prepare polyureas with high overall mechanical properties. Three polyureas containing different amounts of UPy units were synthesized by replacing a portion of isophorone diisocyanate (IPDI) with a UPy-derived diisocyanate. The formation of quadruple hydrogen bonds in hard segments via UPy dimers was confirmed by nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR). The mechanical properties of the polyureas were evaluated by uniaxial tensile testing. Compared to the polyurea without UPy units, remarkable improvements in Young’s modulus, tensile strength, and toughness were simultaneously achieved when UPy units were incorporated. The mechanism behind the strong strengthening effect rooted in the stronger intermolecular forces among hard segments brought by the quadruple hydrogen bonds, which were stronger than the inherent bidentate and monodentate hydrogen bonds among urea groups, and the slower soft segmental dynamics reaveled by both increased T g and relaxation time of the soft segments. The mechanism behind the strong toughening effect was ascribed to more effective energy dissipation brought by the quadruple hydrogen bonds that served as stronger sacrificial bonds upon deformation. This work may offer new insight into the design of polyurea elastomers with comprehensively improved mechanical properties.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 4
·3057-3067
·
IF 11.806
Zhao Sipei,Li Shuiquan,Liu Huihui,Jiang Jin,Wang Meichen,Liu Haolang,Wang Weiwei,Wang Zhi
As a new thermosetting resin, polybenzoxazine has attracted extensive attention because of its excellent properties. However, the biggest challenge of polybenzoxazine is the balance among impact strength, thermal stability, and processability. In this work, we first introduced a 2-ureido-4[1H]-pyrimidone (UPy, containing quadruple hydrogen bonds) dimer into benzoxazine to tackle this challenge. In the blends containing 3 wt% UPy, its toughness and thermal properties have been simultaneously improved, while maintaining a high modulus and a negligible increasement in viscosity. The impact strength and the glass transition temperature ( T g ) reach 16.39 kJ·m −2 and 221 °C, which are 172% and 10 °C higher than that of polybenzoxazine, respectively. Meanwhile, this strategy was extended to carbon fiber surface modification to enhance the interfacial adhesion between fibers and resins. The mechanical properties of modified fiber composites are significantly improved. Furthermore, we firstly designed the cyclic flexural experiment of material and tried to propose an effective method to verify the effect of hydrogen bond dynamics on flexural properties of polybenzoxazine. Here, we not only provide a new way to get a balance among different properties of polybenzoxazine but also give a broad insight on the application of additional hydrogen bonds in thermoset resins. Graphical Abstract The improved comprehensive performances of polybenzoxazine were realized by introducing quadruple hydrogen bond motif.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Energetic Materials Frontiers
·
2024
·
IF 3.3
Xian-zhi Zhou,Cheng-cheng Zeng,Zi-jian Li,Gang Li,Sheng-jun Zheng,Fu-De Nie
Interfacial strength is a key factor affecting the mechanical properties of materials. This study aims to enhance the mechanical properties of energetic polymer bonded explosives (PBXs) by modifying 1,3,5-triamino-2,4,6-trintrobenzene (TATB) crystals—a typical energetic material—using 2-ureido-41H-6-methyl-pyrimidinone (UPy) derivatives with strong hydrogen-bonding interactions. Specifically, strongly adhesive polydopamine (PDA) was employed to graft UPy-functionalized molecules with isocyanate groups (–NCO) and hydroxyl groups (–OH). Scanning electron microscopy (SEM) images indicate that TATB crystals became rougher after being coated with PDA, while the introduction of UPy did not affect the surface morphology. The presence of urethane bond peaks in the samples indicates that UPy-NCO was successfully grafted onto the PDA. UPy is essentially nonpolar and is prone to bind with binders, having the potential to improve the creep resistance of PBXs. Due to the strong interfacial enhancement by UPy and PDA, the tensile strength and compressive strength of the sample grafted with 1 wt% UPy significantly increased by 35.6 % and 26.5 %, respectively. Theoretical calculations indicate interfacial enhancement by UPy introduction, where the strong hydrogen bonding may produce a positive impact. The successful introduction of UPy modified the nature of TATB and improved its interfacial strength, finally enhancing the mechanical properties of the PBXs. The conditions for the grafting reaction in this study are mild and universal and thus can be applied to other compositions.
研究领域:
材料科学
·
化学工程
·
爆炸物研究
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2020
·Vol. 39
·期 3
·327-336
·
IF 3.154
Shi Zhen,Wang Qi,Li Gui-Fei,Shou Yu-Feng,Zong Hong-Jie,Yan Shi-Feng,Zhang Kun-Xi,Yin Jing-Bo
Self-healing hydrogels with the shear-thinning property are novel injectable materials and are superior to traditional injectable hydrogels. The self-healing hydrogels based on 2-ureido-4[1 H ]-pyrimidinone (UPy) have recently received extensive attention due to their dynamic reversibility of UPy dimerization. However, generally, UPy-based self-healing hydrogels exhibit poor stability, cannot degrade in vivo and can hardly be excreted from the body, which considerably limit their bio-application. Here, using poly (l -glutamic acid) (PLGA) as biodegradable matrix, branching α-hydroxy- ω -amino poly(ethylene oxide) (HAPEO) as bridging molecule to introduce UPy, and ethyl acrylate polyethylene glycol (MAPEG) to introduce double bond, the hydrogel precursors (PMHU) are prepared. A library of the self-healing hydrogels has been achieved with well self-healable and shear-thinning properties. With the increase of MAPEG grafting ratio, the storage modulus of the self-healing hydrogels decreases. The self-healing hydrogels are stable in solution only for 6 h, hard to meet the requirements of tissue regeneration. Consequently, ultraviolet (UV) photo-crosslinking is involved to obtain the dual crosslinking hydrogels with enhanced mechanical properties and stability. When MAPEG grafting ratio is 35.5%, the dual crosslinking hydrogels can maintain the shape in phosphate-buffered saline solution (PBS) for at least 8 days. Loading with adipose-derived stem cell spheroids, the self-healing hydrogels are injected and self-heal to a whole, and then they are crosslinked in situ via UV-irradiation, obtaining the dual crosslinking hydrogels/cell spheroids complex with cell viability of 86.7%±6.0%, which demonstrates excellent injectability, subcutaneous gelatinization, and biocompatibility of hydrogels as cell carriers. The novel PMHU hydrogels crosslinked by quadruple hydrogen bonding and then dual photo-crosslinking of double bond are expected to be applied for minimal invasive surgery or therapies in tissue engineering.
研究领域:
生物材料学
·
组织工程学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2014
·Vol. 2
·期 39
·6878-6885
·
IF 0
Yinlei Lin,Guangji Li
The development of hydrogels possessing both excellent self-healing and mechanical properties in hydrogel science due to their tight relationship with the many potential application scopes is of great significance. Herein, a novel class of polyurethane (PU) hydrogels with intermolecular quadruple hydrogen-bonding interactions were designed and fabricated by the copolymerization of poly(ethylene glycol) methacrylate end-capped urethane ether prepolymer (PU-PEGMA) with 2-(3-(6-methyl-4-oxo-1,4-dihydropyrimidin-2-yl)ureido)ethyl methacrylate (SCMHBMA) bearing the 2-ureido-4-pyrimidone (UPy) unit. The effects of the SCMHBMA content on the self-healing behaviors and mechanical properties of the PU hydrogels were investigated. The results indicate that the fabricated PU hydrogels can autonomously and rapidly repair occurring incisions or cracks at ambient temperature without the need for any stimulus and possess high deformability under both tensile and compressive stress and strong recoverability upon removal of stress, thus exhibiting outstanding self-healing, elasticity, robustness and toughness. The presence of UPy units in PU macromolecular chains is a decisive factor endowing the PU hydrogels with these characteristics.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
Small
·
2026
·
IF 11.8
Bokang Liu,Shiyu Cao,Zhengyu Fu,Yawen Wu,Youfa Wang,Fei Chen
Solid-state electrolytes (SSEs) are regarded as promising candidates for high-energy-density lithium metal batteries (LMBs), but their practical application is severely hindered by lithium dendrite growth. Currently, numerous self-healing electrolytes are reported to suppress lithium dendrite growth. However, the self-healing functions reported so far are limited to repairing mechanical damage in the electrolyte membrane caused by lithium dendrite penetration; they cannot repair the lithium dendrites themselves. To address this, we utilize the hydrogen‑bond network formed by UPy‑UPy self‑assembly to design and prepare the composite electrolyte PEG‑UPy@LLZO. This electrolyte not only possesses the ability to self‑heal mechanical damage but also, for the first time, achieves active in‑situ self‑repair of lithium dendrites through the synergistic effect between the polymer and the ceramic filler. Experiments show that after a short‑circuit failure induced by lithium dendrites, the battery's charge‑-discharge function can be restored simply by letting it rest, without any external intervention. The Li symmetric cell exhibits stable cycling for over 1000 h at 0.2 mA cm −2 and 60°C. Furthermore, the LiFePO 4 (LFP) full cell maintains 75.36% capacity retention after 1000 cycles at 1C. This material-based active healing strategy provides a viable pathway to overcome the dendrite challenge in LMBs.
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）